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Marci's Diesel Service -4 - / November 28, 2011 <br /> DIESEL RANGE ORGANICS Results for MW-3 <br /> 400 42 <br /> 350 <br /> 47 <br /> 300 <br /> 52 <br /> 250 <br /> 200 57 5 <br /> 150 p <br /> yyyy 62 <br /> 0 <br /> 10 .. ��z ��.� �, -- --- <br /> 50 I 67 <br /> 72 <br /> DIESEL RANGE ORGANICS Depth 10 Water --- Trend <br /> Risk Evaluation <br /> There are no water supply wells or surface water receptors present within 600 feet of the Site. <br /> Drinking water at and near the Site is currently supplied by the California Water Service <br /> Company, Stockton District. <br /> Recommendation <br /> March 2009, the Fund recommends that this site should be considered for closure. <br /> UPDATED, August 2010, the Fund continues to recommend that the San Joaquin County LOP <br /> consider this site for closure. Further investigation at this site is unlikely to benefit the people of <br /> California. <br /> REVISED, December 2010, though there is a significant mass of heavy hydrocarbons in the <br /> vadose zone, the Fund believes residual hydrocarbons do not threaten local water resources <br /> and further active remediation is unlikely to reach Water Quality Objectives more rapidly or cost <br /> effectively. The Fund continues to recommend that the San Joaquin County LOP consider this <br /> site for closure. <br /> UPDATED, December 2011, source area monitoring wells MW-4 and MW-7 have historically <br /> had elevated concentrations of TPHd in groundwater. However, after 11 years of monitoring, <br /> the groundwater plume is largely limited to the source area. Analytical data indicate that WQOs <br /> have been achieved in the down gradient well. Groundwater within the source area will likely <br /> remain above WQOs for years to decades. The affected shallow groundwater is not used as a <br /> source of water supply nor is it likely to be used as a source of water supply in the foreseeable <br /> future. Water users in the vicinity of the site rely on a public water supply. Based on facts in the <br /> record and hydrologic and geologic conditions at the site, the limited residual petroleum <br /> hydrocarbons that remain in soil and groundwater pose a low risk to human health, safety and <br /> the environment. The Fund recommends that the San Joaquin County LOP review this site for <br /> closure. <br /> Kirk Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br />